| 11. | Time also affects plutonium and enriched uranium, basic materials in nuclear warheads.
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| 12. | Officials fear the highly enriched uranium otherwise could end up in terrorists'hands.
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| 13. | Brazil also reportedly bought highly enriched uranium from China in the 1980s.
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| 14. | Enriched uranium or plutonium is a necessary requirement for a nuclear weapon.
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| 15. | North Korea denies the existence of a weapons program using enriched uranium.
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| 16. | The highly enriched uranium is trucked to Oak Ridge National Laboratories in Tennessee.
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| 17. | Tehran says its equipment was contaminated with enriched uranium by a previous owner.
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| 18. | Enriched uranium is a key component in creating a nuclear bomb.
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| 19. | Plutonium and enriched uranium are two key ingredients of nuclear weapons.
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| 20. | The process involves diluting the highly enriched uranium with natural uranium.
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